IEEEXplore# Adaptive cross-layer protection strategies for robust scalable video transmission over 802.11 WLANs

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Adaptive cross-layer protection strategies for robust scalable video transmission over 802.11 WLANs

van der Schaar, M. Krishnamachari, S. Sunghyun Choi Xiaofeng Xu
Dept. of Electr. & Comput. Eng., Univ. of California, Davis, CA, USA
This paper appears in: Selected Areas in Communications, IEEE Journal on
Publication Date: Dec. 2003
Volume: 21 , Issue: 10
On page(s): 1752 - 1763
ISSN: 0733-8716
Digital Object Identifier: 10.1109/JSAC.2003.815231
Current Version Published: 2004-02-19

Abstract
Robust streaming of video over 802.11 wireless local area networks poses many challenges, including coping with bandwidth variations, data losses, and heterogeneity of the receivers. Currently, each network layer (including physical layer, media access control (MAC), transport, and application layers) provides a separate solution to these challenges by providing its own optimized adaptation and protection mechanisms. However, this layered strategy does not always result in an optimal overall performance for the transmission of video. Moreover, certain protection strategies can be implemented simultaneously in several layers and, hence, the optimal choices from the application and complexity perspective need to be identified. In this paper, we evaluate different error control and adaptation mechanisms available in the different layers for robust transmission of video, namely MAC retransmission strategy, application-layer forward error correction, bandwidth-adaptive compression using scalable coding, and adaptive packetization strategies. Subsequently, we propose a novel adaptive cross-layer protection strategy for enhancing the robustness and efficiency of scalable video transmission by performing tradeoffs between throughput, reliability, and delay depending on the channel conditions and application requirements. The results obtained using the proposed adaptive cross-layer protection strategies show a significantly improved visual performance for the transmitted video over a variety of channel conditions.

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